/Engine/Source/Editor/UnrealEd/Public/IProjectExternalContentInterface.h
Called upon AddExternalContent completion
typedef TBaseDelegate_TwoParams< void, bool, const [TArray](API\Runtime\Core\Containers\TArray)< [TSharedRef](API\Runtime\Core\Templates\TSharedRef)< [IPlugin](API\Runtime\Projects\Interfaces\IPlugin) > > & > FAddExternalContentComplete